How to drag the line in a line chart ？

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How to drag the line in a line chart ？Do you have some examples?

Posted 26-Jun-12 20:08pm

PEIYANGXINQU

Updated 26-Jun-12 20:09pm

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Posted 27-Jun-12 1:38am

Nitin11

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lukeer · Accepted Answer · 2012-06-27T03:09:00

You first have to draw the line within some OnPaint method. In the process of doing so, you need to have its co-ordinates handy.

Dragging means to press a mouse button, move the mouse and release the button. On pressing the button (OnMouseDown), you get the current cursor co-ordinates. Check how they relate with your dragable line. You will want to define some hit area around the line because forcing your users to hit it exactly will drive them crazy.

If you decide to let the dragging start, do so and move the line's co-ordinates along with the mouse (OnMouseMove). Do so until user releases the mouse. Don't forget to Invalidate() your control every now and then or every moved pixel to actually see the dragging.

Stop dragging OnMouseUp.